(385695) 2005 TO74
| Discovery [1][2][3] | |
|---|---|
| Discovered by |
C. Trujillo S. S. Sheppard |
| Discovery site | Las Campanas Obs. |
| Discovery date | 8 October 2005 |
| Designations | |
| MPC designation | (385695) 2005 TO74 |
| 2005 TO74 | |
|
Neptune trojan · L4 [4] centaur [1] · distant [2] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 10.02 yr (3,661 days) |
| Aphelion | 31.585 AU |
| Perihelion | 28.458 AU |
| 30.021 AU | |
| Eccentricity | 0.0521 |
| 164.50 yr (60,082 days) | |
| 281.30° | |
| 0° 0m 21.6s / day | |
| Inclination | 5.2596° |
| 169.46° | |
| 308.44° | |
| Physical characteristics | |
| Dimensions |
93 km (est. at 0.10)[5] 100 km[6] |
| 23.2[6] | |
| 8.3[1] | |
|
| |
(385695) 2005 TO74 is a minor planet and the fourth Neptune trojan discovered.[4] It was first observed with an apparent magnitude of 23.2 on 8 October 2005, by American astronomers Scott Sheppard and Chad Trujillo at Las Campanas Observatory in Chile.[2][3]
Orbit
It orbits near Neptune's L4 Lagrangian point about 60° ahead of Neptune and thus has the about same orbital period as Neptune. The Neptune-resonance should keep it more than 19 AU from Neptune for 14,000 years.[3] As of 2016, it is 25.5 AU from Neptune. 2005 TO74 is located close to the boundary separating stable orbits from unstable ones, and it may be influenced by a secular resonance.[7]
Physical characteristics
Diameter
The discoverers estimate that 2005 TO74 has a mean-diameter of 100 kilometers based on a magnitude of 23.2.[6] Based on a generic magnitude-to-diameter conversion, it measures approximately 93 kilometers in diameter using an absolute magnitude of 8.3 with an assumed albedo of 0.10.[5]
Numbering and naming
Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined.[1][2] If named, it will follow the naming scheme already established with 385571 Otrera, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.
References
- 1 2 3 4 5 "JPL Small-Body Database Browser: 385695 (2005 TO74)" (2013-10-06 last obs.). Jet Propulsion Laboratory. Retrieved 4 August 2017.
- 1 2 3 4 "385695 (2005 TO74)". Minor Planet Center. Retrieved 4 August 2017.
- 1 2 3 MPEC 2005-U97 : 2005 TN74, 2005 TO74
- 1 2 "List Of Neptune Trojans". Minor Planet Center. 10 July 2017. Retrieved 4 August 2017.
- 1 2 "Asteroid Size Estimator". CNEOS/JPL. Retrieved 4 August 2017.
- 1 2 3 Lakdawalla, Emily (13 August 2010). "2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point". The Planetary Society. Retrieved 4 August 2017.
- ↑ Zhou, Li-Yong; Dvorak, Rudolf; Sun, Yi-Sui (2011). "The dynamics of Neptune Trojans – II. Eccentric orbits and observed objects". Monthly Notices of the Royal Astronomical Society. 430 (3): 1849–1860. Bibcode:2011MNRAS.410.1849Z. arXiv:1007.5362
. doi:10.1111/j.1365-2966.2010.17566.x.
External links
- AstDys-2 about 2005 TO74
- (385695) 2005 TO74 at the JPL Small-Body Database